The refrigeration tightener is an important part of the refrigeration and air conditioning system. In the process of operating the air conditioning and refrigeration system, the power consumption of the refrigeration crunch accounts for about 40% of the power consumption of the entire system, and in practice, the annual uniform load is about 60% of the peak heat load, and as long as the capacity of the crunch is about 50%, this will form a crunch machine in the process of operation, there is a large local time will operate under low load.
The application of refrigeration tightener to the refrigeration and air conditioning system should be based on the practical situation of the air conditioner to stop reasonable application, such as in large and medium-sized cold storage and central air conditioning system, can use screw type, piston type, centrifugal type and other types of tightening machine, but also should ensure that the tightening mechanism creates its due conditioning function, can be according to the change of working conditions of the refrigeration tightening machine stop effective adjustment, better adapt to the change of working conditions, so as to effectively improve the operating efficiency of the refrigeration and air conditioning system, more conducive to the energy saving of the system operation.
For example, in the process of using a centrifugal compressor, the compressor mainly uses the change of the inlet guide blade opening to adjust the intake volume, so as to regulate the cooling capacity, which is usually called fan door conditioning. From the current operation of the refrigeration and air conditioning system, although the door conditioning can play a certain energy-saving role, but the door conditioning will cause the load current of the motor to decrease, so that the voltage and speed of the motor remain constant, this situation will not completely change the problem of low efficiency under low load of the motor, and cannot achieve the purpose of energy saving.
However, if the general frequency converter is used for speed regulation, the attached loss, inherent loss and other losses of the motor will fall, so that the voltage, current and speed frequency of the motor will also fall, the motor power consumption will also decrease with the flow, and the control accuracy of the operating parameters will also improve. Under this circumstance, the uniform power saving of the variable speed centrifugal compressor is more than 30%, and the power saving reaches more than 70% when the load is low, which is a refrigeration technology worth promoting in the operation of the refrigeration and air conditioning system in the future.